ATC-1425B

a-trend ATC-1425B Mainboard user's guide

SYSTEM FEATURES

: Supports all of 5V and 3.3V 486 CPUs, includes AmDX4-100/120, Am5x86-P75, and Cyrix 5x86.
: Flexible architecture to support 128/256/512KB Direct mapped cache scheme.
: Supports 4 stage power saving: On/Doze/Standby/Suspend.
: Supports L1/L2 Write back/Write through cache feature.
: Supports 72-pin dual type SIM modules.
: Memory configurations from 1MB up to 256MB by using 256KB/ 1MB/4MB/8MB/16MB/32MB/64MB SIM module.
: Supports SMI/SMM/PMU/APM power controllers.
: Dual IDE connectors support up to four devices in two channels.
: On-board high speed I/O includes 2 serial (16550 fast UART compatible), 1 parallel (EPP/ECP), and 1 FDC.

CHECK LIST OF THE PACKING
The mainboard comes securely packed in a durable box and shipping carton.
Inside the box, the mainboard is sandwiched between two sheets of sponge and packed in an anti-static bag.

Each mainboard containing:
Q'TY Description

1 Mainboard : ATC-1425B
1 Diskette : Enhanced IDE driver (3.5").
1 Cable : Enhanced IDE connector.
1 Cable : F.D.D connector.
1 Cable : Serial port.
1 Cable : Serial/Parallel.
1 Manual : User`s manual.

If any of the above items is missing or damaged, please contact the dealer from whom you purchased.

NOTE : Leave the mainboard in its original packing until you are ready to install it.

CPU type setting

A. General setting

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24
486DX(5V)	open	open	1-2	2-3	2-3	open	open
486SX	open	open	1-2	2-3	2-3	open	open

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31
486DX(5V)	open	open	1-2,3-4	open	open	open	3-4
486SX	open	open	2-3	open	open	open	open

B. INTEL CPU setting

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24
P24T	open	1-2	1-2	open	1-2	open	1-2
P24D	open	1-2	open	1-2	1-2	1-2	1-2
S-SERIES	open	1-2	1-2	2-3	2-3	open	open

A80486DX4-100 &EW is "WRITE-BACK" type, set "P24D" type.

A80486DX4-100 &E is "WRITE-THROUGH" type, set "S-SERIES" type.

C. AMD CPU setting

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24
Am5x86-P75	close	1-2	1-2	1-2	1-2	1-2	1-2
Enhanced Am486	open	1-2	1-2	1-2	1-2	1-2	1-2
Am486DXL(3.45V)	open	2-3	*1-2/2-3	open	2-3	open	open

*(1-2 486DX4; 2-3 486DX2)

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31
Am5x86-P75	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4
Enhanced Am486	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4
Am486DXL(3.45V)	open	3-4	1-2,3-4	4-5	open	open	1-2,3-4

A80486DX4-100SV8B and A80486DX4-120SV8B are "WRITE-BACK" type, set "Enhanced Am486" type.

A80486DX4-100NV8T and A80486DX4-120NV8T are "WRITE-THROUGH" type, set "Am486DXL(3.45V)" type, JP20 set "1-2".

D. CYRIX CPU setting

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24
CYRIX CX486	open	1-2	1-2	1-2	2-3	open	2-3
CYRIX 5x86	open	1-2	1-2	1-2	2-3	1-2	1-2

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31
CYRIX CX486	2-3	2-3	1-2,3-4	1-2	open	2-3	3-4
CYRIX 5x86	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4

CPU speed setting

CPU SPEED
JP14
JP13
JP12

DX25/DX2-50/DX4-75
OPEN
OPEN
OPEN

DX33/DX2-66/DX4-100
OPEN
CLOSE
CLOSE

DX40/DX2-80/DX4-120
OPEN
OPEN
CLOSE

DX50
OPEN
CLOSE
OPEN

CPU voltage setting

CPU Voltage
JP34
JP35

5V
1-2
open

3.45V
2-3
1-3,2-4

4V
2-3
3-5,4-6

NOTE: Am5x86-P75+ please follow the setting as 'Enhanced Am486','DX50', and '3.45V '; JP10 set '2-3'.

Am5x86-P90 please follow the setting as 'Am5x86-P75', 'DX40', and '3.45V'; JP10 set '2-3'.

SIM MODULES INSTALLATION

The SiS 486 PCI/ISA mainboard can be expanded from 1MB to 256MB by using 256K, 1MB, 2MB, 4MB, 8MB, 16MB, 32MB, and 64MB of 72-pin SIM module.

"Free Table" feature is offered for main memory configuration. The product

works with one SIMM plugs into any SIMM sockets.

SRAM INSTALLATION

This mainboard can support cache memory from128K to 512K bytes with the types of 32KX8, 64KX8, or 128KX8 SRAM.

Cache Configuration Size

Cache

Size
TAG SRAM

(U21)
DATA SRAM

(U17-20)
JP16
JP32
JP33
JP36

128K
8KX8
32KX8
1-2
1-2
1-2
1-2,3-4

256K
32KX8
64KX8
2-3
1-2
2-3
1-2,3-4

512K
32KX8
128KX8
1-2
2-3
2-3
1-2,3-4

OTHER JUMPERS SETTING

Other jumpers setting

JP10
JP38*

Synchronous clock
1-2
Flash ROM
1-2, 5-6

Asynchronous clock
2-3
EPROM
2-3, 5-6

The pin-5 and pin-6 is fixed by factory default setting.

J11

External Battery
1-2

Internal Battery
2-3

Clear CMOS
3-4

Connectors description

Connector
Description

J12 Reset

J13 HDD LED

J14 Turbo LED

J15 Turbo Switch

J16 Speaker Connector

J17 Keylock

AWARD BIOS SYSTEM CONFIGURATION SETUP

This chapter explains how to set up system configuration (CMOS) under the AWARD BIOS. The SETUP program is stored in the ROM on the mainboard. To do the SETUP procedure, press <Del> key when the system is booting up. The following main menu will appear. Please select "STANDARD CMOS SETUP" to enter the next screen.

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI CONFIGULATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc: Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2: Change Color
Virus protection, Boot sequence ...

The section at the bottom of the main menu explains how to control this screen. Another one section displays theitems highlighted in the list.

This screen records, some basic hardware information, set the system clock and error handling. These records can be lost or corrupted if the on-board battery is fail or weakness.

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI CONFIGULATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc: Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2: Change Color
Virus protection, Boot sequence ...

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

Date (mm:dd:yy) : Mon, Oct. 2 1995
Time(hh:mm:ss) : 3 : 17 : 1
HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE
Primary Master : AUTO 0 0 0 0 0 0 --------
Primary Slave : AUTO 0 0 0 0 0 0 --------
Primary Slave : AUTO 0 0 0 0 0 0 --------
Primary Slave : AUTO 0 0 0 0 0 0 --------

Drive A : 1.2M, 5.25 in.	Base Memory : 640K
Drive B : None	Extended memory : 11264K
	Other Memory : 384K
Video : EGA/VGA	------------------------------------------------
Halt On: All Errors	Total Memory : 12288K
ESC : Quit Enter : Select Item PU/PD/+/- : Modify
F1 : Help (Shift) F2 : Change Color

This screen is a list of system configuration options. Some of them are defaults required by the mainboard's design, others will be depended on the features of your system.

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI CONFIGULATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc: Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2: Change Color
Virus protection, Boot sequence ...

ROM PCI/ISA BIOS (2A4IBA2H)

BIOS FEATURES SETUP

AWARD SOFTWARE , INC.

Virus Warning	: Disabled	Video BIOS Shadow : Enabled
CPU Internal Cache	: Enabled	C8000-CFFFF Shadow : Disabled
External Cache	: Enabled	D0000-D7FFF Shadow : Disabled
Quick Power On Self Test	: Disabled	D8000-DFFFF Shadow : Disabled
Boot Sequence	: A, C
Swap Floppy Drive	: Disabled
Boot Up Floppy Seek	: Enabled
Boot Up NumLock Status	: On
Boot Up System Speed	: High
Gate A20 Option	: Fast
Typematic Rate Setting	: Disabled
Typematic Rate (Chars/Sec)	: 6
Typematic Delay (Msec)	: 250	Esc : Quit Enter : Select Item
Security Option	: Setup	F1 : Help U/PD/+/- : Modify
		F5 : Old Values (Shift)F2:Color
		F6 : Load BIOS Defaults
		F7 : Load Setup Defaults

This screen controls the setting for the chipset on the mainboard.

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI CONFIGULATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc: Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2:Change Color
At clock, DRAM timings ....

ROM PCI/ISA BIOS (2A4IBA2H)

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

Auto Configuration	: Enabled	Onboard 496B IDE Port	: Both
		IDE 0 Master Mode	: Auto
ISA Bus Clock	: 7.159MHz	IDE 0 Slave Mode	: Auto
LBD# Sample Point	: End of T2	IDE 1 Master Mode	: Auto
		IDE 1 Slave Mode	: Auto
Cache Write Cycle	: 2 CCLK	IDE Prefetch Read Buffer	: Disable
Cache Burst Read Cycle	: 1 CCLK	IDE HDD Block Mode	: Enable
L2 Cache/DRAM Cycle WS	: 2 CCLK
		Onboard FDC Control	: Enable
DRAM RAS to CAS Delay	: 3 CCLK	Onboard Serial Port 1	: COM1
DRAM Write Cycle	: 1 WS	Onboard Serial Port 2	: COM2
DRAM Write CAS Pulse	: 2 CCLK	Onboard Parallel Port	: 378H
DRAM CAS Precharge Time	: 1 CCLK	Onboard Printer Mode	: Compatible
DRAM RAS to MA Delay	: 1 CCLK
DRAM Speed	: Faster
DRAM Slow Refresh	: Disable	Esc: Quit	Enter : Select Item
		F1 : Help	PU/PD/+/- :Modify
CPU Burst Write	: Disabled	F5 : Old Values	(SHIFT)F2: Color
L2 Cache Policy	: Write Back	F6 : Load BIOS Defaults
L2 Cache Tag Bits	: 8 bits	F7 : Load Setup Defaults

This screen controls the 'green' features of the mainboard.

ROM PCI/ISA BIOS (2A4IBA2H)

POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI CONFIGURATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc : Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2:Change Color
Sleep Timer, Suspend Timer .....

ROM PCI/ISA BIOS (2A4IBA2H)

POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

Power Management	: Disabled	IRQ 4 (COM1)	:Enable
PM Control by APM	: Yes	IRQ 5 (LPT 2)	:Enable
Video Off Option	: Susp,Stby -> Off	IRQ 6 (Floppy Disk)	:Enable
Video Off Method	: V/H SYNC+Blank	IRQ 7 (LPT 1)	:Enable
Suspend Switch	: Disable	IRQ 8 (RTC Alarm)	:Disable
** PM Timers	**	IRQ 9 (IRQ2 Redir)	:Enable
HDD Off After	: Disable	IRQ10(Reserved)	:Enable
Doze Mode	: Disable	IRQ11(Reserved)	:Enable
Standby Mode	: Disable	IRQ12(PS/2 Mouse)	:Enable
Suspend Mode	: Disable	IRQ13(Coprocessor)	:Enable
** PM Events	**	IRQ14(Hard Disk)	:Enable
PCI Master Activity	: Disable	IRQ15(Reserved)	:Enable
COM Ports Activity	: Enable
LPT Ports Activity	: Enable	Esc : Quit	Enter : Select Item
HDD Ports Activity	: Enable	F1 : Help	PU/PD/+/-:Modify
DMA Ports Activity	: Disable	F5 : Old Values	(Shift) F2 : Color
VGA Activity	: Disable	F6 : Load BIOS Defaults
IRQ3 (COM 2)	: Enabled	F7 : Load Setup Defaults

This screen configures the PCI Bus slots.

ROM PCI/ISA BIOS (2A4IBA2H)

POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP
PCI CONFIGURATION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc : Quit	Enter : Select Item
F10: Save & Exit Setup	(Shift)F2:Change Color
Sleep Timer, Suspend Timer .....

ROM PCI/ISA BIOS (2A4IBA2H)

PCI CONFIGURATION SETUP

AWARD SOFTWARE, INC.

PnP BIOS Auto-Config	: Enable	PCI Master Burst Read/Write : Disable

Slot 1 Using INT#	: AUTO
Slot 2 Using INT#	: AUTO
Slot 3 Using INT#	: AUTO




PCI IRQ Actived By	: Edge
PCI IDE 2nd Channel	: Enable
PCI IDE IRQ Map To	: PCI - AUTO
Primary IDE INT#	: A	Esc: Quit Enter : Select Item
Secondary IDE INT#	: B	F1 : Help PU/PD/+/-:Modify
Master Arbitration Protocol	: Weak	F5 : Old Values (Shift)F2:Color
CPU->PCI Mem Post Write Buf	: Enable	F6 : Load BIOS Defaults
CPU->PCI Memory Burst Write	: Disable	F7 : Load Setup Defaults

The last step is 'save and exit'. If you select this item and press 'Y', then these records

will be save in the CMOS memory on the mainboard. It will be chected every time when

you turn your computer on.

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP	PASSWORD SETTING
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING
PCI/GREEN FUNCTION SETUP
LOAD BIOS DEFAULTS
LOAD SETUP DEFAULTS
Esc : Quit	Enter : Select Item
F10: Save & Exit Setup	(SHIFT)F2:Change Color
Save data to CMOS & Exit setup

ROM PCI/ISA BIOS (2A4IBA2H)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP		PASSWORD SETTING
BIOS FEATURES SETUP		IDE HDD AUTO DETECTION
CHIPSET FEATURES SETUP		SAVE & EXIT SETUP
POWER MANAGEMENT SETUP		EXIT WITHOUT SAVING
PCI/GREEN FUNCTION SETUPLOAD
LOAD BIOS DEFAULTS	SAVE to CMOS and EXIT (Y/N):Y
LOAD SETUP DEFAULTS
Esc : Quit
F10: Save & Exit Setup		(SHIFT)F2:Change Color
Save data to CMOS & Exit setup

CPU SPEED	JP14	JP13	JP12
DX25/DX2-50/DX4-75	OPEN	OPEN	OPEN
DX33/DX2-66/DX4-100	OPEN	CLOSE	CLOSE
DX40/DX2-80/DX4-120	OPEN	OPEN	CLOSE
DX50	OPEN	CLOSE	OPEN

Cache Size	TAG SRAM (U21)	DATA SRAM (U17-20)	JP16	JP32	JP33	JP36
128K	8KX8	32KX8	1-2	1-2	1-2	1-2,3-4
256K	32KX8	64KX8	2-3	1-2	2-3	1-2,3-4
512K	32KX8	128KX8	1-2	2-3	2-3	1-2,3-4

	JP10		JP38*
Synchronous clock	1-2	Flash ROM	1-2, 5-6
Asynchronous clock	2-3	EPROM	2-3, 5-6

Connector	Description
J12	Reset
J13	HDD LED
J14	Turbo LED
J15	Turbo Switch
J16	Speaker Connector
J17	Keylock